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But the Victorian native said he sought the move to be closer to friends and family.

Cameron's manager Colin Young said on Friday the livewire forward wanted a trade to Brisbane for personal reasons.

"There are compassionate reasons why Charlie has asked to go back to Brisbane," Young told AFL Trade Radio.

"It's where he grew up and it's where his family and friends are.

"He feels that there's more to life than playing football."

While the trade period does not start for three days, there was plenty of activity on Friday.

Tall utility Jackson Trengove joined the Western Bulldogs on the first day of AFL free agency after Port Adelaide opted not to match the Dogs' contract offer.

Trengove was a restricted free agent, meaning Port had three days to match the Bulldogs' offer, but he left with their blessing.

His move came as no surprise after falling out of favour with Port coach Ken Hinkley late in the season.

Also on Friday:

* Geelong have joined clubs showing interest in Melbourne key position player Jack Watts, with Patrick Dangerfield saying the former No.1 draft pick has plenty of potential

* Bulldogs list manager Jason McCartney said All-Australian Jake Stringer will not go cheaply, insisting they want a good first-round pick and they are prepared to retain him if the right deal is not struck

* Stringer is yet to confirm his preferred club, but Essendon are understood to be frontrunners

* Fremantle delisted ruckmen Jon Griffin and Zac Clarke, while North Melbourne did the same with midfielder Sam Gibson

* Aaron Francis, Essendon's No.6 pick in the 2015 draft, wants a trade back to his home state of SA. But he is under contract until 2019 and his manager Michael Doughty concedes a deal with either Adelaide club is unlikely